Bottom portion housing of a mobile device



FIG. 1 is a first side view of an ornamental design of an embodiment of a bottom portion housing of a mobile device showing our new design;

FIG. 2 is a second side view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front view thereof, the rear view is a mirror image; and,

FIG. 6 is an enlarged isometric view thereof.

The broken lines shown in FIGS. 1–6 are included for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a bottom portion housing of a mobile device, as shown and described. 